Have TRACTOR Pistons Changed In 50 YEARS?

[@JAMSIONLINE]

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[@blueovalfan23]

what about balance? we've had issues at work with ipd pistons having inconsistent weights. destroyed several blocks. doubt it'll help solve the issues at hand but it might be good to know.

[@domenicomonteleone3055]

I have a question what about the weight of the piston does that account to anything in what you have done in the process hi 👋 from # YSW 🇨🇦 where I follow you 💯 both !!

[@THEMOWERMEDIC1]

Preordered mine! Thanks For every one of your informative videos.

[@billygragg218]

😅j

[@bigal5747]

The only thing 2 machinists can agree on is... The 3rd machinist is doing it wrong

[@brandons9138]

Oh man. That is so right.

[@williamgrissom9022]

When a young grad student, I was in the engineering school machine shop and one machinist was fussing to me that another machinist was stupid to drill a large hole by slowly stepping up in drill size, as if I knew any better (no undergrad courses on machining nor shop). He said all you needed was a tiny pilot hole and the final drill would follow it straight down. Perhaps the hole ends up more centered that way, but I step up drill bits gradually at home. Maybe I could get by with a two-fer if my drill bits were ground perfectly but I just eyeball them on a grinding wheel when re-sharpening. At least they had a quality drill press which secured the parts, but drilling a hole on a milling machine or lathe would likely hold center better.

[@bigal5747]

@@williamgrissom9022 whatever gets the job done. At home you can do it however you want!

[@cm9247]

🤣

[@bobbywallacw323]

It's obvious that you've been in a shop that's had at least three Machinists ! 😂

[@rickysmith8099]

You guys work great together never loose that with your pops I lost mine in 2006 it think of him every day stay safe my friends

[@philstabile173]

Firstly i really enjoy watching your first rate machining your quality of work is second to none.an overfueling injector pump will send cylinder temps skyrocketing only "race spec"ring end gap could have survived such an event.

[@tdkrei]

Science is always fun (for some of us). You mentioned that the old piston had TIn coating. As a retired machinist (CNC and Manual) I have had considerable experience wi9th this coating as well as others. The primary reason for TIn coating is lubrication. It's applied to carbide for that very reason not to have chip buildup on the cutting edge. I could have influence on the heat variation also on the wearing capabilities. Good video gentleman. Keep on smiling.

[@dennisyoung4631]

Tin, as in Sn - tin metal - VS “TiN, i.e. *Titanium Nitride?* The first is sort of a silvery color, vis Titanium Nitride (on, say, TPG222 inserts - what some of my lathe tooling takes) have more of a gold color.

[@kevind1865]

They most certainly were not coating tractor pistons with TiN in the 70's. He means actual elemental tin (Sn), as in tin cans.

[@tdkrei]

Wonderful!

[@tdkrei]

Pardon me for being so stupid.

[@tdkrei]

OK, let's put this in perspective, first I did not clarify nor state that, that was used in the 50's second I only suggested the purpose of Tin coating not anything to do with Alais tractors. Gees, give it a rest, please.

[@N57RU]

The one thing I would like to see is the difference in the ring groove depth diameter between the Old Old and the New Old pistons.

[@TurboDog73TX]

Excellent detective work guys. I REALLY like that piston measuring tool.

[@cavsh00ter]

Love the way you take things apart and actually find out the whys and how comes TO COOL

[@dadoVRC]

The main reason there's a steel or cast iron ring for the upper piston ring is to make a thermal barrier to it, to avoid or reduce cooking, and it's also useful to keep the groove shape to the right dimensions, to allow the ring to be pressurised by combustion gasses. Also, if the ring has a conical section, meant to "hammer" slightly in the groove to clean off combustion residues, the hard groove surface allow it to last a lot longer. The small dimensions of the embedded ring can't make any difference to thermal expansion of the aluminium, it is going to stretch when hot!

[@tpfromcentralpa1692]

As someone who uses these brand of parts in other engine makes, I am glad you sectioned the pistons, was neat to see. Does any other companys offer kits for 426 Allis's other than Reliance?

[@hiscifi2986]

The 1915 parts manual for BSA motorcycles states that a Cast-Iron Piston was an option back in the day. So we have moved on a lot since then. Honda die cast pistons were a major step forward from the old soft aluminium Hepolite machined pistons.

[@randymagnum143]

All the old Hondas I ever had had broken rings and smoked like the neighborhood mosquito patrol! On the other hand, *forged* aluminum tractor pistons? I've seen them with tens of thousands of hours on them.

[@alistairshanks5099]

Great methodical fault analysis even though that was not the reason for the failure and it at least ruled it out and points to the ring gap theory. If the pump was causing over fueling and the crown of the piston was running hotter than it should have then the ring gap may be the answer. Another reason manufacturers could be running less clearance between pistons and bores is the improvement in lubricants as well as other improvements in metals and machining.

[@MAIDENCOMMONRAIL]

Nice job...i think we dont take enough time to make some analisys of product or failure...but one thing is missing in your test...the thermal change on the cylinder sleeve itself Keep the good work

[@zvondiesel]

Absolutely 💯 you can't go off old factory specs ,when using new manufactured parts myself I learned that expensive lesson aswell especially when building David brown engines

[@goosenotmaverick1156]

David brown, didn't they manufacturer some of those funny two wheel tractors at one point? I know there was a few companies that did, like gravely being the one I see most commonly. Probably not what you're working on, but just curious.

[@zvondiesel]

@@goosenotmaverick1156 David brown was with case tractor and dozer division and possibly with other companies

[@goosenotmaverick1156]

@@zvondiesel gotcha. The ones I'm thinking of I can't remember the name, so I'm trying to figure it out. Obviously not David brown then lol neat! I've been working on my neighbors Ford 6600 for a few years basically restoring it one bit at a time. It's been a buggar, I'm a car guy not a tractor guy, but it's been fun too. We started at the front and are working our way back lol front end (wear pins, bushing, wheel bearings, etc), engine (entire rebuild), new clutch kit, trans (all bearings and worn parts replaced), steering system (pump, gear, lines, linkages), pto clutch, hydro pump, spool valves for remotes. Eventually I'll have to dig into the brakes but for right now that's all functioning properly and adjusted. Dude has spent astronomical amounts of money thus far.

[@craigstrickland1572]

Safety squints work! OSHA approved!! I was squinting once trying to make a crush sleeve out of some junk metal for a gate wheel. Didn't get anything in my eyes....my chest caught on fire though with all the sparks but you didn't hear that from me!

[@scottallpress3818]

Awesome video , was thinking about this engine issue again the other day . Glad it’s now sorted .

[@stephenpoe2037]

Interesting research . Time well spent . Thanks for sharing !

[@jamest.5001]

As it goes, the way I see it, you would been better off just keeping the pistons and sleeves, just get new rings, and hone the sleeves! Get them back to a round square! (Close as possible) and reassemble a loose engine, I have 'rebuilt' lawnmower engines doing less than that, I just honed the bore. Cleaned the rings with 320 sand paper. And reassembled the engine, and it was fine! It would barely run before, low compression, burned oil. And was almost like a new engine , I know a diesel is a lot different, and would only be a option, if you had zero other options, at best it would probably get you through a season or two! Possibly putting the rings in a oven at 350°f - 450°f for about 45 minutes, then quench may help put the spring back in the rings! Or warp them, so new rings is the better idea! (The better of bad ideas!)

[@midgetrace]

I believe the extra thickness on the piston is so the slug can be machined to different bore sizes.

[@robstewart8691]

"Thats what ive been telling you since you started this youtube thing"....cleaning guy is a savage 😂

[@JAMSIONLINE]

Lol and he's not joking even hahahaha

[@robstewart8691]

@@JAMSIONLINE your thousands of followers say otherwise! Keep up the good work guys

[@Midnight_Rider96]

Infared thermometers domt read shiny surfaces accurately, i found that out doing weld testing. Shiny ground surface the reading was all over, dull mill scale it was consistent

[@iainburgess8577]

Thats interesting. I wonder if the block side of the tolerance window has a larger variance. But as you said, the manufacturing & quality control changes of the last 50 years are significant; but not something that can be tested adequately; you'd need a hundred or so samples for a limited test.

[@andrewklahold2880]

Yes but as to yesterday's quality today we would think parts should have better quality as to 50 yrs ago I have a 1957 D8 caterpillar that has cast ring lands and no tin coating was able to reuse all the Pistons with new wet sleeves new rings

[@iainburgess8577]

@@andrewklahold2880 exactly why I said tolerance & not quality. I know full well that for everything we do better today, there a way it's done worse because that's cheaper. Your example is the direct opposite of what Jamsi is dealing with, but the irony is that single examples never give the full picture. Your machine could have been from a mob W better quality control & tighter tolerances, or it could be the one best motor they ever build, at the whims of random chance. Jamsi could be the Worst for their make of tractor (tho they mentioned at least 1 other, so..), or a bad fluke. There's a Lot of maintenance issues that come back to cumulative tolerance interactions, that are simply troubleshot until the thing works Well Enough. We both know that D8 could never have been built to be that perfect after all that time; no more than the tractor was build to be a first of its kind failure. That's just not possible without large numbers of units for random chance to work with.

[@Ham68229]

It's been a proven fact that today we use better materials than what was used say, 20-100 yrs ago. Great video. cheers :)

[@chrisschmidt4792]

Well, the sleeves expand and contract too. Wonder what the differences are in those.

[@TheJohndeere466]

Those inserts in the top of the piston are ductile iron I believe. There is a company in Salem, Ohio that makes those inserts for casting into pistons and they make them from centrifigally cast ductile iron.

[@bradjenkins932]

Quaker Castings.

[@TheJohndeere466]

Ive machined about .010" off the top of pistons for use in pulling tractors because the top gets hot enough to grab the cylinder walls. They sometimes grab the cylinder even with .050" clearance at the top. The insert around the ring cuts like ductile iron.

[@WingspeedGarage]

I think you would be amazed how far of the clearances were from the factory. All US engines from 1950->1990

[@brandonclifton2027]

Happy birthday to the big guy!🎉🎉🎉

[@woodpurposedmechanic8299]

Not sure you are considering that piston's can have a different cam grind. Basically that's an oval shape. I had my own pistons made for my race cars back in the day and I had to specify a cam. I can't tell you that I know what is good and bad or how to determine a clearance from the cam spec. I knew what worked from the guys that I apprenticed with and the difference between the Venolia and Arias pistons popular at the time. The Arias pistons needed a lot more clearance. Damn those things made a lot of noise before the engine came to temp but if you didn't make those clearances loose you would have pistons that look your failed pistons in the video. I really need to find that old engine log book.

[@bradbengtsson8984]

I’ve found that IR temp guns don’t work so good on hot Al. Put a piece of polyamide tape on the surface and point the gun at that. You will get more accurate readings.

[@Raise986]

Mom ain't home, you know what that means: PISTONS IN DA OVEN

[@richardscott2622]

It would be informative to know the results of the liner bore specs after installation with the dial bore gage....

[@edsmachine93]

Great video guys. Nice evaluation and comparisons. Thanks for sharing. 👍

[@dresdensvo]

Great 4 stroke artwork . I would frame it in my auto repair shop if it was in poster form .

[@jamesbegley2700]

I may have missed, discussion on old diesel fuel vs low sulphur new fuel?

[@hummingbirdlogisticsinc6762]

What is blueprinting of an engine; if you're liner is new what piston would you please with that liner at 4.259?

[@oldman9642]

Was wondering what the temperature reached is when the piston is under actual running conditions?? Figure a coolant temperature of 210 the piston must be much higher than 300 degrees. Friction, multiple explosions, etc.?

[@ZMAN_420]

Great Content! 👍🏻🇺🇲

[@irench]

FYI a non contact doesn't accurately measure temp on reflective surfaces.

[@JAMSIONLINE]

Did the best w/ what we had.

[@potlimit2002]

A lot of recency bias in this video. I am a tool & die maker and in 2020 I made some A-2 tool steel parts for an Auto parts manufacture. I made 12 total parts, 6 out of a bar of A-2 that was produced in 1978 (stamped production date)and 6 out of a newly purchased bar from McMaster Car. All 12 parts were heat treated by a respected and very professional company. Three of the parts from the McMaster A-2 delaminated during heat treating. The other 3 parts quickly failed from stress cracks all while the 1970’s A-2 parts are still in use in day to day production process with no issue. The original pistons that lasted 40 or more years was most likely produced 100% in the USA, even the material they were made from. On the other hand the aftermarket pistons most likely were made from materials produced in China or India. It’s common knowledge among Machine Tool rebuilders that the old American Iron was vastly superior to the modern day equivalent. It’s not the when but the who.

[@alwayssearching1882]

I think the cleaning guy should annually get the father of the year award.

[@dnixon8767]

Thumbs up to a mom who is tolerant of her boys' shenanigans to allow use of her oven.

[@locker1325]

So after all this. The fix was to do what exactly? More ring clearance, less ring clearance.

[@justinlea2406]

Very much enjoy these videos.

[@JAMSIONLINE]

Thank you for watching!

[@matthewtroiano3024]

Ordered a work mat cant wait to get it.

[@JAMSIONLINE]

Appreciate you!

[@rereg543]

Love these sorts of videos!

[@thorwaldjohanson2526]

I'm a few mins in before seeing the results of the tests. The fact that you are testing your hypothesis makes you NOT idiots. Even if the hypothesis was wrong. As an engineer / scientist this makes me love your channel even more. Can't wait to see the results :)

[@jeffcooper5789]

This was a great video and like how you researched the pistons. You came to a conclusion. It would have been nice to be able to look at the fuel pump and find out what could have been wrong with it. Can I get some credit hours for this lecture?

[@JAMSIONLINE]

You sure can, but we’re not an accredited school so it won’t transfer anywhere 😂

[@jeffcooper5789]

@@JAMSIONLINE Oh darn but still worth watching. Thanks for responding.

[@terrytinney]

Infrared heat guns don't work very well on shiny or reflective surfaces

[@Timberns]

One more question… How much expansion do you expect from the cylinder bore?

[@adnacraigo6590]

You guys do some deep ciphering in that shop.

[@biomechanique6874]

Okay. What oil are you using?

[@grantensrud9185]

Hi guys I wouldn't let the comment section get to you. I am a performance diesel enthusiasts and a member of many boards on the subject. When it comes to failure analysis in the diesel internet realm opinionated keyboard Warriors are many😂 Watching the advancements in injection, tuning, longevity and emissions studies I got to say in my opinion you have been right on track. This was caused by injection timing...

[@maestromecanico597]

Science is good. 😁 The ultimate litmus test is how the machine is running now and at the end of the season.

[@andrewklahold2880]

I still think it was timing

[@JAMSIONLINE]

Same

[@CUTTERUPROB]

good video guys

[@raynyhus2026]

Next find the old and new rings and do the same measurements to put the final nail in this coffin. Cool video.

[@garyshope8378]

These are the fellers u need to listen to

[@realsonnysullivan]

that was awesome.

[@specialk5070]

Sloppy loose baby! Just like my woman!! Yeah man!! U dudes did right and shiz happens lesson learned 🇺🇸🤙 now go forth and build🌟✊

[@lukesky1415]

I might be talking out of my ass here but if the issue was clearance, wouldn't all the pistons be scored/show signs of overheating? If you guys have the time, can you guys check the pressure that the water pump is sending water? My guess is that something might be restricting passage to the front cylinders (the ones getting hotter) or there is just not enough pressure to circulate coolant through the engine at a fast enough rate. Again, something is wrong on one half of the engine, that means that if what you machined and spec'd is uniform, then it can't be what you just machined.

[@randyhall2135]

Hey guys , you do incredible work. Was wondering if we could get a little update on how your Allis Chalmers engine rebuild is working out?

[@JAMSIONLINE]

Ran great this spring! Won't run again until this fall maybe or next spring.

[@domenicomonteleone3055]

​@@JAMSIONLINEi have a question to ask you both is there any way to weight the piston when you are doing the measurements so you could have a accurate reading yes or no hi from # YSW 🇨🇦 I love following you beacuse you open up many things I never knew about respect back to you both.

[@DJ-bh1ju]

Love how you have such a respectful, professional relationship with your father. You both share such a love for what you do - and it shows in the interaction between you.

[@warbirdwf]

I love the fact that you invested the time to investigate this clearance issue further. I was hoping you would heat the pistons up to see the potential expansion differences and you did. Nice job to you both.

[@lovesloudcars]

I loved his comment about I've been telling you the whole time since you started this KZbin thing we're wasting time. Very funny I laughed.

[@SightsNjunk]

I loved the banter. Always joking, with a bit of truth. Makes me think of my father. I love your videos, both for the information, and for the interactions and little stories.

[@JAMSIONLINE]

Thanks for watching!

[@ryanp0342]

Great video. Just a recommendation when comparing and displaying data, graph it in a simple plot. Makes it a lot easier for people to see the differences.

[@MikeHarris1984]

I trust your guys is findings of anybody else's. Everybody online is just a keyboard warrior who thinks that they know everything because they watch the video somewhere. And someone might be an actual expert in the field and some did come forward and actually help you guys out to find the real issue. But many are not and just those warriors who think that they are the smartest person in the room because they watch the video somewhere sometime. But you can't see a lot of things through a video and feel and with the video you only get the gist of what happened or during the time frame not the 100 plus hours put into it broken down into a 15 minute video. But I think you guys keep reiterating and going through even more data showing and proving that all these keyboard warriors are wrong is really good justification and hopefully get them to finally shut up. Because you guys know the experts in this field and when you need help you reach out and get help from other shops and things and so KZbin has been a great thing for that. But you guys do some amazing work. Makes me wish I lived over that way because I have an LS2 that they need to get fully machined and decked and gone thru. Where my plans are to build a big high horsepower naturally aspirated engine for my '05 GTO and there's just been sitting in the garage for the last couple years. Now that I have a C7 for my daily driver I can take my GTO and really deck it out have fun drag car out of it

[@Stevie_D]

That was interesting - to measure is to know and cutting those pistons apart supplied a lot of useful information to your process ... and it was cool to see how they were made!

[@brocluno01]

Well done. Old guy here. Have built a few engines in my time. I can say that ring gap kills more engines than anything other than bad lifters with flat tappet cams ... 🙃

[@av8tore71]

I went to an estate sale and bought a couple Lycoming IO-360 aircraft engines and they came with boxes and boxes of spare parts. One of the boxes contained a MC-1 Measuring Center Base Kit

[@Awkward_Fox]

That's a hell of a grab! Probably wasn't a cheap estate sale pickup though. Hope the engines run well, and are going to good use keeping someone aloft!

[@av8tore71]

@@Awkward_Fox Im rebuilding one and donated the other to the local A&P school at the community college.

[@Sherlock067]

Nice addition to the tool crib! Cleaning guy has got to get that cutting saw cleaned out ! Great information guys!👍

[@josephlawless6013]

Everything goes into the tolerance. The internal changes could also affect expansion and the reason they made the changes. As usual your assumptions are spot on with what you find. Any time you change from OEM there are changes. Even new OEM parts can have changes based on updates in everything.

[@greggobleman270]

You mentioned the tin coating on the old pistons. Goldsmithterry in his comment also pointed out the lubrication of tin. It's like older USA made light bulbs. Tin and brass bulbs screw into their sockets easily. Modern Chinese made bulbs made from melded down Chevy's and Ford's will gall often times. Could that tin coating be important on the clearance issues?

[@mikebrown41182]

I have a question, have you ever tried WPC treatment on any pistons?

[@spud435]

Interesting Back during the energy crunch the Government paid GM to do a study on when to replace parts for fuel savings. On the wheel bearing back then you repacked every brake change and inspected. The result were all over the place and rerunning the test decided to make half worn out bearing to speed up the test but that kind of tolerances could only be done in the lab. And much to their surprise they hadn't wore out by the end of the test. And after retooling with tighter tolerances half wore out no break in wheel bearing went from if your lucky 20,000 miles to 50,000. Bearing was the main fault in alternators but with the new bearing was still having problems. To tight of a belt puts to much side load and the answer the serpentine belt. All thanks to a small Gov study on fuel saving.

[@michaelferretti7869]

I have to say even though i know nothing about machine shops, I'm mesmerized watching your videos! I'm curious, how long does it take to machine a V8 block that just needs boring for oversized pistons?

[@PinyonGear]

Incorrect piston sidewall clearance does not crack valves if they never make contact. Back to combustion temps and injection timing.

[@gratefultrucker7781]

Yup and a turbocharged non after cooled non piston cooled engine can be fine but it has much less margin for error on heat.

[@williamwertman24]

Im curious where you guys get your tolerance numbers from for your builds with the newer materials. Some are not so easy to find. I do some light rebuilds (more so assembly after machining) and want to get it to some more of the building and machining in house. I've done machine work in the past and really enjoyed it.

[@SR-ml4dn]

Thanks for the video it was interesting to see. I'm curious about the piston grooves concentricity because together with the piston rings they will position the piston in the liner. For big ship engines we call that for scuffing when the piston grind against the liner wall. The piston rings are also coated with a soft metal compound that will wear up.

[@LHW-kg9cp]

Really enjoy your videos! I'm curious, how wear is there in ID of cylinder in ring travel area of cylinder? IE, were could you have honed original sleeves and just installed new rings instead of using all new?

[@chuckg9805]

As Schultz said - very interesting. The real big deal is a clean empty work bench in the shop - that took some work. Thanks for the video's.

[@sfr2929]

I know in our race engines, a lot of the clearance is partially determined by the additive packs in the oil being used. Question is, would the oil used in the 70s vs today have anything to do with the clearance given by the books? Not saying the material difference in the alloy isnt a part of it as well.

[@tonyking9235]

JIM I HAVE TO DISAGREE WITH YOU THAT YOUR BOY IS WASTING HIS TIME WITH UTUB TERRORIST. YOU FORGET HE MADE YOU LOOK GOOD AS THE SWEEPER UPER 🤣🤣 REMEMBER YOUR PLACE . OLD MAN 😊😊⚘⚘

[@GNX157]

Great work. You should try and reach out to Lake Speed Jr at Total Seal Rings and maybe do an online consult. He really knows his stuff when it comes to pistons and especially end gaps on rings and how that affects engine performance.

[@logancarter2134]

Watching y'all work and listening to y'all talk I had the realization that y'all and all the other people like you are the salt of the earth and what has made this country great and why it's worth fighting for.

[@rickpalechuk4411]

Pretty smart for custodial staff 😄 Cheers

[@bcbloc02]

Your results indicate no real change in material. Most of the measurements change was in the low part of the piston and the new piston clearly has a larger brace ring to make the skirt stronger. This would also effect the measurements. Being within .001” on a 4” bore over a 300 deg temp spread is negligible. I usually shoot for .001” clearance/inch of bore size.

[@PCMenten]

Very nicely done. Enjoyed how thorough you both were. 👍

[@chumbuddy100]

nice job looking at the geometry of the piston (skirt diameter across temperatures) . I did see a difference in the geometry (more / less material) of the skirt below the pin boss. this may make a difference in the thermal growth in that area and the stiffness of the skirt below the pin boss. the question of material type is still unknown. there are a lot of different alloys of aluminum.

[@tedmoss]

Expansion will likely be less in a harder alloy.

[@MikeHarris1984]

10:50 that eagle is bad ass!!! Such a beautiful bird of prey! In Phoenix, we have a lot of Red Tail Hawks, Owls, Vulchures, and very fsr out, eagles. But you rearly will see an eagle ever. They have sanctuary areas at the lakes that are out in the middle of the desert. But i live in a 3 year old house i had built out in the edge of the city in the middle of the desert. My digs, i had to build a fenced in cage from air and land. The birds if prey around here is insane and owls, natures most perfect killer, get pets all the time. Hawks do too. But so different from living in the middle of the city. We also have bobcats, just caught one with kittens in my front yard the other night on cam, and big packs of coyotes. We then also have wild donkeys all over that walk down our streets.

[@danielgemmell3340]

Freezer full of steak lost me yummy 😋

[@76629online]

I have a couple of comments. First of all, I really enjoy your channel, and I have watched most of the videos. However, for whatever reason, this channel has more commercials on it than any other channel I have ever watched on KZbin. It drives me bonkers. Now, for some comments on this video, perhaps this is the problem with your new engine parts… Who knows what kind of material these people are using. If I had to guess I would say it’s just random recycled junk iron: kzbin.info/www/bejne/poPNdqSYpqmieMUsi=ElTU5lw2NLUT23nE

[@mikekahl4745]

As a farmer and shade tree mechanic, i am in all with the skill both of you possess.

[@leilanihayes787]

I am really surprised you did not compare the cam grind on the shirts of old and new piston.

[@jeanlawson9133]

If one was part of the Four stroke sequence which one would he be... AIN'T IT JUST AIN'T IT 😜 lols..... Cool Merch... Great video....

[@davidrfowler6432]

2 things that also require investigating are the original engine oil viscosity ( oil pressure ) and oil pump flow output , if you used a thinner oil then that might also be the part culprit. the oil pump gears may have been spaced larger to account for the thicker engine oil used during those periods to maintain correct oil pressure ( upwards or over 75 psi oil pressure was correct for engines ) i remember an old flathead ford V 8 showing 94 psi on the pressure gauge

[@mtut]

If you watch the teardown videos, the bearings looked like new. And even the old bearings looked pretty good for an old machine. They were getting plenty of pressure. Piston skirts are more or less splash-lubricated on this engine and if anything, a lower-viscosity oil would reach those parts sooner and lubricate as well, assuming sufficient film strength. The original engine probably called for 10W30 or 15W40 and those oils are still made and used widely. A 10W30 is the same viscosity today as it ever was. I don't quite remember what they were using for oil, but there's no indication they used anything lighter. And I haven't used a 5W40 or 0W40 synthetic in these, but again, even if they did, the bearings look beautiful and the rings and pistons should have been happy. I've seen engines that were diluted so bad there really was an oil pressure problem (injector pump that was leaking into the crankcase and washed the oil out through the breather). Bearings were spun; cylinders looked surprisingly good. There was also a lot of evidence that the injector pump was faulty and causing excessive heat in (some of) the combustion chambers. Supposedly the injector pump was overhauled while the engine was rebuilt, but the engine was rebuilt because of issues that pointed to a bad injector pump (cracked rings, scored pistons). And apparently after the overhaul the timing was off 180 degrees. I would guess that more than timing, the matter was due to cross-leaks in the pump that the overhaul didn't address - otherwise, why were some of the cylinders still in good shape while 3 of them were cooked? But they didn't get all the data they asked for from the company that rebuilt the injection pump the second time.

[@davidrfowler6432]

@@mtut that comment brings back a memory of a video i watched on youtube around 2009 , where a machinist was questioned why some farmers were removing the thermostats from their tractor engines , his reply was , tractor engines run hot ,sometimes very hot ,resulting in blown head gaskets ,removing the thermostats from the engines allows the engine coolant to be constantly cooled ,thus resulting in lower engine operating temperatures and less head gasket failures

[@popswrench2]

listening while fixing my toilet .... 7040 i did , mid 1980s .... spec was .0025 - .005 ; (Piston cooling jets) , it ran few hundred hours well , until chisel plow in MUD , "squeeked" . one center Oring rolled out and cut , pushed in justa little . cleaned up measured , REsleeve/kit , we were going again . now MANY people remember the 301 specs 0045 - 009 , if memory serves . common aftermarket sizing is 006 - 007 avg. some 7000 needed conversion to oil jet bearing of 7010/7020 with the tight OEM kits . i had one such engine .

[@archangel20031]

Does a mouse pad really need to ship with a certificate of authenticity??? I highly doubt anybody's going to be counterfeiting a copy of your mouse pad.

[@jeanlawson9133]

Newer Piston verses older Engine block casting...Can there, and is there a lubrication issue... Possibly seizure...What about the chemistry or alchemy of the Piston metal..itself , between the two Piston. And actually the new sleeves could possibly have Metal chemistry difference that could effect... this whole thing..

[@franknukemcomegetsome2744]

Is anybody addressing engine oil quality? EPA regulations have eliminated vital antiwear additives that have been common Since the 1950s.🐱